Veteran Member

KLM fly AMS to Bordeaux, which would be the fastest. Train would take most of the day and probably not be any cheaper. Cheapest easyJet to London Stansted, then Ryanair to Biarritz or Pau? Depends on connections, and what price you can get for the date you want to travel.

You could always walk, of course - depends how much time you have. ;-)